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RE: HUMAN AGING, AN UNDYING FISH AND THE CONCEPT OF TRANSDIFFERENTIATION
Hmm immortality. I feel the jelly fish doesn't have real immortality, since it just reverses time when it gets old. It's just cheating death😝
I recently came across a type of shark(can't remember the name. It's quite ugly though) that has been living for at least 270 years, and possibly 500 years. So this shark was alive in the 16th century😮.
But it still isn't immortal, as it also ages, albeit very slowly. Nice article, very well researched.
I think the shark you are refering to is the greenland shark and its about 512 years old, as a matter of fact there are lots of animals with a very long life span, the turtle for example, what makes them different from the immortal jellyfish is the fact that though they age very slowly, at some point age would catch up to them and they'd die, the immortal jellyfish on the other hand wont die of old age and that's why it's technically immortal